{"id":176,"date":"2026-06-08T09:19:03","date_gmt":"2026-06-08T09:19:03","guid":{"rendered":"https:\/\/onionmail.org\/blog\/?p=176"},"modified":"2026-06-08T09:19:03","modified_gmt":"2026-06-08T09:19:03","slug":"how-to-attach-email-to-email","status":"publish","type":"post","link":"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/","title":{"rendered":"How to Attach Email to Email: Complete Guide for 2026"},"content":{"rendered":"<div class=\"quick-summary\" style=\"background: #f5f5f5; padding: 20px; margin-bottom: 30px; border-left: 4px solid #333;\">\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">In this article<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a96c08dda21d\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a96c08dda21d\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#quick-summary\" >Quick Summary<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#why-attach-an-email-instead-of-forwarding\" >Why Attach an Email Instead of Forwarding?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#prerequisites\" >Prerequisites<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#method-1-gmail-web-interface\" >Method 1: Gmail (Web Interface)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#step-1-enable-the-right-view\" >Step 1: Enable the Right View<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#step-2-select-emails-to-attach\" >Step 2: Select Email(s) to Attach<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#step-3-drag-and-drop\" >Step 3: Drag and Drop<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#alternative-three-dot-menu-method\" >Alternative: Three-Dot Menu Method<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#method-2-outlook-desktop-client\" >Method 2: Outlook (Desktop Client)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#windows-steps\" >Windows Steps<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#mac-steps\" >Mac Steps<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#attaching-multiple-emails\" >Attaching Multiple Emails<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#method-3-thunderbird\" >Method 3: Thunderbird<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#method-4-privacy-focused-email-services\" >Method 4: Privacy-Focused Email Services<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#protonmail\" >ProtonMail<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#onion-mail\" >Onion Mail<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#tuta-tutanota\" >Tuta (Tutanota)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#mailfence\" >Mailfence<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#method-5-apple-mail-macosios\" >Method 5: Apple Mail (macOS\/iOS)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#macos-mail\" >macOS Mail<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#ios-mail-iphoneipad\" >iOS Mail (iPhone\/iPad)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#method-6-export-and-attach-manually\" >Method 6: Export and Attach Manually<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#universal-export-method\" >Universal Export Method<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#example-saving-gmail-message-source\" >Example: Saving Gmail Message Source<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#understanding-email-file-formats\" >Understanding Email File Formats<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#troubleshooting-common-issues\" >Troubleshooting Common Issues<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#issue-%e2%80%9cdrag-and-drop-doesnt-work%e2%80%9d\" >Issue: &#8220;Drag and Drop Doesn&#8217;t Work&#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#issue-%e2%80%9cattachment-size-too-large%e2%80%9d\" >Issue: &#8220;Attachment Size Too Large&#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#issue-%e2%80%9cmsg-files-wont-open%e2%80%9d\" >Issue: &#8220;.msg Files Won&#8217;t Open&#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#issue-%e2%80%9cheaders-are-missing%e2%80%9d\" >Issue: &#8220;Headers Are Missing&#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#issue-%e2%80%9crecipients-cant-open-encrypted-attachments%e2%80%9d\" >Issue: &#8220;Recipients Can&#8217;t Open Encrypted Attachments&#8221;<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#security-and-privacy-considerations\" >Security and Privacy Considerations<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#metadata-exposure\" >Metadata Exposure<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#encryption-best-practices\" >Encryption Best Practices<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#legal-and-compliance\" >Legal and Compliance<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#advanced-tips-and-workflows\" >Advanced Tips and Workflows<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#batch-processing-multiple-emails\" >Batch Processing Multiple Emails<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#automating-email-attachment-with-filters\" >Automating Email Attachment with Filters<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-39\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#cross-platform-compatibility\" >Cross-Platform Compatibility<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-40\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#email-attachment-capabilities-by-service-2026\" >Email Attachment Capabilities by Service (2026)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-41\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#conclusion\" >Conclusion<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-42\" href=\"https:\/\/onionmail.org\/blog\/how-to-attach-email-to-email\/#next-steps\" >Next Steps<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3 style=\"margin-top: 0;\"><span class=\"ez-toc-section\" id=\"quick-summary\"><\/span>Quick Summary<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Attaching emails preserves full headers, metadata, and formatting\u2014unlike forwarding<\/li>\n<li>Methods vary significantly across Gmail, Outlook, Thunderbird, and webmail providers<\/li>\n<li>Privacy-focused services like Onion Mail and ProtonMail support .eml file attachments<\/li>\n<li>Mobile apps have limited support; desktop clients offer the most flexibility<\/li>\n<li>Attached emails typically appear as .eml or .msg files<\/li>\n<\/ul>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"why-attach-an-email-instead-of-forwarding\"><\/span>Why Attach an Email Instead of Forwarding?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before diving into the how-to, it&#8217;s important to understand when attaching an email makes more sense than simply forwarding:<\/p>\n<ul>\n<li><strong>Preserves complete headers:<\/strong> Full routing information, authentication results, and server data remain intact<\/li>\n<li><strong>Spam reporting:<\/strong> Security teams need original headers to trace malicious senders<\/li>\n<li><strong>Legal documentation:<\/strong> Courts and compliance officers require unmodified email evidence<\/li>\n<li><strong>Multiple message sharing:<\/strong> Attach several related emails to provide full context<\/li>\n<li><strong>Prevents inline editing:<\/strong> Recipients can verify the message hasn&#8217;t been altered<\/li>\n<\/ul>\n<p>When you forward an email, the original headers are often stripped or modified, and the content becomes part of your new message body. Attaching preserves the email as a distinct, standalone file.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"prerequisites\"><\/span>Prerequisites<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Before you begin, ensure you have:<\/p>\n<ul>\n<li>Access to your email client (desktop application or web browser)<\/li>\n<li>The email(s) you want to attach available in your inbox or folders<\/li>\n<li>Sufficient attachment size limits (most services allow 25-50MB total)<\/li>\n<li>For encrypted services: recipient&#8217;s public key if using PGP (optional but recommended)<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"method-1-gmail-web-interface\"><\/span>Method 1: Gmail (Web Interface)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Gmail&#8217;s web interface makes attaching emails straightforward, though the feature isn&#8217;t immediately obvious.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"step-1-enable-the-right-view\"><\/span>Step 1: Enable the Right View<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ensure you&#8217;re using the standard Gmail view (not basic HTML). The option only works in the full interface.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"step-2-select-emails-to-attach\"><\/span>Step 2: Select Email(s) to Attach<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Navigate to your inbox or folder containing the target email<\/li>\n<li>Hover over the email you want to attach (don&#8217;t open it)<\/li>\n<li>Click the checkbox on the left side of the email row<\/li>\n<li>For multiple emails: check multiple boxes while holding Shift for consecutive emails<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"step-3-drag-and-drop\"><\/span>Step 3: Drag and Drop<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>With email(s) selected, click and hold on any selected email<\/li>\n<li>Open a new compose window (click &#8220;Compose&#8221; in another tab or window)<\/li>\n<li>Drag the selected email(s) into the body of the new message<\/li>\n<li>Release when you see the attachment indicator appear<\/li>\n<\/ol>\n<p>The emails will attach as individual .eml files, preserving all headers and content.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"alternative-three-dot-menu-method\"><\/span>Alternative: Three-Dot Menu Method<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Open the email you want to attach<\/li>\n<li>Click the three-dot menu icon (\u22ee) in the top right<\/li>\n<li>Select &#8220;Forward as attachment&#8221;<\/li>\n<li>A new compose window opens with the email already attached<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"method-2-outlook-desktop-client\"><\/span>Method 2: Outlook (Desktop Client)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Microsoft Outlook for Windows and Mac offers robust email attachment capabilities, saving messages as .msg files.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"windows-steps\"><\/span>Windows Steps<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Open Outlook and navigate to the folder with your target email<\/li>\n<li>Create a new email message (Ctrl+N or click &#8220;New Email&#8221;)<\/li>\n<li>Arrange windows so you can see both the new message and your inbox<\/li>\n<li>Click and drag the email from your inbox directly into the body or attachment area of the new message<\/li>\n<li>The email attaches as a .msg file with its original subject as the filename<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"mac-steps\"><\/span>Mac Steps<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Select the email(s) you want to attach in your mailbox view<\/li>\n<li>Click &#8220;Message&#8221; in the menu bar<\/li>\n<li>Select &#8220;Forward as Attachment&#8221; (or press Option+Cmd+F)<\/li>\n<li>A new compose window opens with the selected email(s) attached<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"attaching-multiple-emails\"><\/span>Attaching Multiple Emails<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Hold Ctrl (Windows) or Cmd (Mac) while clicking multiple emails, then drag them all at once into your new message. Each becomes a separate .msg attachment.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"method-3-thunderbird\"><\/span>Method 3: Thunderbird<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Mozilla Thunderbird is a popular open-source email client with strong privacy features and straightforward email attachment functionality.<\/p>\n<ol>\n<li>Open Thunderbird and select the email(s) you want to attach<\/li>\n<li>Right-click on the selected email<\/li>\n<li>Choose &#8220;Forward As&#8221; \u2192 &#8220;Attachment&#8221;<\/li>\n<li>Alternatively, select multiple emails, then go to Message \u2192 Forward As \u2192 Attachment<\/li>\n<li>A new compose window opens with emails attached as .eml files<\/li>\n<\/ol>\n<p>Thunderbird preserves full headers and works seamlessly with both standard and encrypted email accounts.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"method-4-privacy-focused-email-services\"><\/span>Method 4: Privacy-Focused Email Services<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Privacy-conscious users often rely on encrypted email providers. Here&#8217;s how major services handle email attachments:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"protonmail\"><\/span>ProtonMail<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>ProtonMail supports attaching emails through their web interface:<\/p>\n<ol>\n<li>Log into ProtonMail at protonmail.com<\/li>\n<li>Navigate to the email you want to attach<\/li>\n<li>Open the email and click the three-dot menu (\u22ee)<\/li>\n<li>Select &#8220;More&#8221; \u2192 &#8220;View source&#8221;<\/li>\n<li>Copy the raw email source<\/li>\n<li>Compose a new message<\/li>\n<li>Create a .txt or .eml file with the source content and attach it traditionally<\/li>\n<\/ol>\n<p>Alternatively, use ProtonMail Bridge with Thunderbird or Outlook for native email attachment support. Bridge creates a local IMAP\/SMTP server that decrypts messages for desktop clients while maintaining end-to-end encryption during transmission.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"onion-mail\"><\/span>Onion Mail<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Onion Mail operates over Tor and supports standard email protocols with strong privacy protections:<\/p>\n<ol>\n<li>Access your Onion Mail account via their .onion address or clearnet gateway<\/li>\n<li>For webmail users: Download the email you want to attach (right-click \u2192 &#8220;Save as&#8221; \u2192 .eml format)<\/li>\n<li>Compose a new message<\/li>\n<li>Attach the saved .eml file like any other attachment<\/li>\n<li>For maximum privacy: encrypt the attachment with recipient&#8217;s PGP key before sending<\/li>\n<\/ol>\n<p>Onion Mail&#8217;s PGP integration allows you to attach encrypted emails and re-encrypt them for new recipients, useful when forwarding sensitive correspondence through additional privacy layers.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"tuta-tutanota\"><\/span>Tuta (Tutanota)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Tuta uses proprietary encryption that encrypts subject lines and doesn&#8217;t support traditional .eml exports:<\/p>\n<ol>\n<li>Open the email you want to share<\/li>\n<li>Use the &#8220;Forward&#8221; function (which includes full headers in the body)<\/li>\n<li>For preservation: take a screenshot or copy full text including headers<\/li>\n<li>Consider exporting your Tuta account periodically for backup purposes<\/li>\n<\/ol>\n<p>Tuta&#8217;s architecture prioritizes security over interoperability, making traditional email attachment more difficult by design.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"mailfence\"><\/span>Mailfence<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Mailfence supports OpenPGP and standard protocols:<\/p>\n<ol>\n<li>Log into Mailfence webmail<\/li>\n<li>Open the target email<\/li>\n<li>Click &#8220;More&#8221; \u2192 &#8220;Download&#8221; to save as .eml file<\/li>\n<li>Compose new message and attach the downloaded .eml file<\/li>\n<li>Optional: sign or encrypt the entire message with OpenPGP<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"method-5-apple-mail-macosios\"><\/span>Method 5: Apple Mail (macOS\/iOS)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"macos-mail\"><\/span>macOS Mail<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Open Mail and select the email(s) you want to attach<\/li>\n<li>Click &#8220;Message&#8221; in the menu bar<\/li>\n<li>Select &#8220;Forward as Attachment&#8221;<\/li>\n<li>Or drag emails directly from your mailbox into a new compose window<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"ios-mail-iphoneipad\"><\/span>iOS Mail (iPhone\/iPad)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>iOS Mail has limited support for attaching complete emails:<\/p>\n<ol>\n<li>Open the email you want to attach<\/li>\n<li>Tap the forward arrow icon<\/li>\n<li>iOS will inline-forward the content (doesn&#8217;t preserve as .eml)<\/li>\n<li>For true attachment: use the Files app to save a screenshot or forwarded copy first<\/li>\n<\/ol>\n<p><strong>Note:<\/strong> Mobile email clients generally lack full email attachment capabilities. For important use cases (legal, security), use desktop clients.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"method-6-export-and-attach-manually\"><\/span>Method 6: Export and Attach Manually<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When your email client doesn&#8217;t support direct attachment, export emails manually:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"universal-export-method\"><\/span>Universal Export Method<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Open the email you want to attach<\/li>\n<li>Look for &#8220;View Source,&#8221; &#8220;Show Original,&#8221; or &#8220;Download&#8221; options<\/li>\n<li>Save the email as a .eml or .txt file to your computer<\/li>\n<li>Compose a new email<\/li>\n<li>Attach the saved file using the standard attachment button<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"example-saving-gmail-message-source\"><\/span>Example: Saving Gmail Message Source<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>Open the email in Gmail<\/li>\n<li>Click the three-dot menu (\u22ee)<\/li>\n<li>Select &#8220;Show original&#8221;<\/li>\n<li>Click &#8220;Download original&#8221; in the new window<\/li>\n<li>A .eml file downloads to your computer<\/li>\n<li>Attach this file to any new email<\/li>\n<\/ol>\n<h2><span class=\"ez-toc-section\" id=\"understanding-email-file-formats\"><\/span>Understanding Email File Formats<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Attached emails typically use these formats:<\/p>\n<ul>\n<li><strong>.eml:<\/strong> Standard email format readable by most clients (Thunderbird, Windows Mail, Apple Mail)<\/li>\n<li><strong>.msg:<\/strong> Microsoft Outlook proprietary format; requires Outlook or third-party viewers<\/li>\n<li><strong>.mbox:<\/strong> Unix mailbox format containing multiple emails<\/li>\n<li><strong>.txt:<\/strong> Plain text source with full headers; universally readable but no formatting<\/li>\n<\/ul>\n<p>For maximum compatibility, .eml format is recommended. Recipients can double-click to open in their default email client.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"troubleshooting-common-issues\"><\/span>Troubleshooting Common Issues<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"issue-%e2%80%9cdrag-and-drop-doesnt-work%e2%80%9d\"><\/span>Issue: &#8220;Drag and Drop Doesn&#8217;t Work&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Solutions:<\/strong><\/p>\n<ul>\n<li>Ensure JavaScript is enabled in your browser<\/li>\n<li>Try the alternative menu method (Forward as Attachment)<\/li>\n<li>Check browser compatibility (Chrome, Firefox, and Edge work best)<\/li>\n<li>Disable browser extensions that might interfere with drag-and-drop<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"issue-%e2%80%9cattachment-size-too-large%e2%80%9d\"><\/span>Issue: &#8220;Attachment Size Too Large&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Solutions:<\/strong><\/p>\n<ul>\n<li>Remove large attachments from the original email before attaching<\/li>\n<li>Compress multiple emails into a .zip archive<\/li>\n<li>Use cloud storage links for very large email collections<\/li>\n<li>Check your provider&#8217;s limits: Gmail (25MB), Outlook (20MB), Onion Mail<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"issue-%e2%80%9cmsg-files-wont-open%e2%80%9d\"><\/span>Issue: &#8220;.msg Files Won&#8217;t Open&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Solutions:<\/strong><\/p>\n<ul>\n<li>Install a .msg viewer (free tools available for Windows, Mac, Linux)<\/li>\n<li>Ask the sender to resend as .eml format instead<\/li>\n<li>Use online .msg converters (note privacy implications)<\/li>\n<li>Open in Microsoft Outlook or Outlook.com<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"issue-%e2%80%9cheaders-are-missing%e2%80%9d\"><\/span>Issue: &#8220;Headers Are Missing&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Solutions:<\/strong><\/p>\n<ul>\n<li>Verify you used &#8220;Forward as Attachment&#8221; not regular &#8220;Forward&#8221;<\/li>\n<li>Check if your email service strips headers (some privacy services do this)<\/li>\n<li>Export using &#8220;Show Original&#8221; or &#8220;View Source&#8221; methods<\/li>\n<li>Contact your email provider about header preservation policies<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"issue-%e2%80%9crecipients-cant-open-encrypted-attachments%e2%80%9d\"><\/span>Issue: &#8220;Recipients Can&#8217;t Open Encrypted Attachments&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Solutions:<\/strong><\/p>\n<ul>\n<li>Ensure recipient has your PGP public key imported<\/li>\n<li>Send encryption instructions or public key in a separate message<\/li>\n<li>Consider using encrypted services like Onion Mail or ProtonMail where encryption is automatic<\/li>\n<li>For sensitive content, verify recipient&#8217;s encryption capabilities first<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"security-and-privacy-considerations\"><\/span>Security and Privacy Considerations<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When attaching emails, especially sensitive ones, consider these privacy factors:<\/p>\n<h3><span class=\"ez-toc-section\" id=\"metadata-exposure\"><\/span>Metadata Exposure<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Attached emails contain full headers revealing:<\/p>\n<ul>\n<li>IP addresses of senders<\/li>\n<li>Email server routing information<\/li>\n<li>Timestamps down to the second<\/li>\n<li>Email client and device information<\/li>\n<\/ul>\n<p>If privacy is critical, redact headers or use services like Onion Mail that minimize metadata collection from the start.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"encryption-best-practices\"><\/span>Encryption Best Practices<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li><strong>Encrypt the entire message:<\/strong> Use PGP to encrypt both your message body and attachments<\/li>\n<li><strong>Verify recipient identity:<\/strong> Confirm public keys through secondary channels<\/li>\n<li><strong>Use end-to-end encrypted services:<\/strong> ProtonMail, Tuta, and Onion Mail encrypt by default<\/li>\n<li><strong>Consider threat model:<\/strong> Government <a href=\"https:\/\/onionmail.org\/blog\/massie-federal-bill-flock-camera-funding\/\">surveillance<\/a>, corporate espionage, or casual privacy needs require different approaches<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"legal-and-compliance\"><\/span>Legal and Compliance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>For legal or compliance purposes:<\/p>\n<ul>\n<li>Never modify email content before attaching<\/li>\n<li>Preserve all headers and metadata<\/li>\n<li>Use .eml format for court admissibility<\/li>\n<li>Maintain chain of custody documentation<\/li>\n<li>Consider using services with compliance features (Mailfence offers digital signatures)<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"advanced-tips-and-workflows\"><\/span>Advanced Tips and Workflows<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"batch-processing-multiple-emails\"><\/span>Batch Processing Multiple Emails<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>When attaching many emails:<\/p>\n<pre><code># Thunderbird: Select multiple with Ctrl+Click (Windows) or Cmd+Click (Mac)\r\n# Then Message \u2192 Forward As \u2192 Attachment\r\n\r\n# Gmail: Use search operators to find related emails\r\nfrom:sender@example.com subject:\"project alpha\"\r\n# Select all results, drag into new compose window\r\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"automating-email-attachment-with-filters\"><\/span>Automating Email Attachment with Filters<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Some email clients allow automated forwarding as attachment:<\/p>\n<ol>\n<li>Create a filter\/rule in your email client<\/li>\n<li>Set condition (e.g., emails from specific sender)<\/li>\n<li>Set action to &#8220;Forward as attachment&#8221; to designated address<\/li>\n<li>Useful for automated reporting or archiving workflows<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"cross-platform-compatibility\"><\/span>Cross-Platform Compatibility<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To ensure attachments work across all platforms:<\/p>\n<ul>\n<li>Use .eml format instead of .msg when possible<\/li>\n<li>Test with recipients on different clients before bulk sending<\/li>\n<li>Include instructions for opening attached emails<\/li>\n<li>Provide alternative access methods (screenshots, PDF exports)<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"email-attachment-capabilities-by-service-2026\"><\/span>Email Attachment Capabilities by Service (2026)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0;\">\n<thead>\n<tr style=\"background: #333; color: white;\">\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Service<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Native Attachment<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Format<\/th>\n<th style=\"padding: 10px; border: 1px solid #ddd;\">Bridge\/IMAP<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Gmail<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Yes<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">.eml<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Yes<\/td>\n<\/tr>\n<tr style=\"background: #f9f9f9;\">\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Outlook<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Yes<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">.msg<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Yes<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">ProtonMail<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Via Bridge<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">.eml<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Yes (Bridge required)<\/td>\n<\/tr>\n<tr style=\"background: #f9f9f9;\">\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Onion Mail<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Manual export<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">.eml<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Yes<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Tuta<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">No<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">N\/A<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">No<\/td>\n<\/tr>\n<tr style=\"background: #f9f9f9;\">\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Mailfence<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Manual export<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">.eml<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Yes<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Thunderbird<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">Yes<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">.eml<\/td>\n<td style=\"padding: 10px; border: 1px solid #ddd;\">N\/A (is client)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Attaching emails to emails is a fundamental skill for anyone handling sensitive correspondence, managing legal matters, reporting security issues, or simply organizing complex email threads. While the process varies across different email clients and services, the core concept remains the same: preserve the original message with full headers and metadata intact.<\/p>\n<p>For everyday users, mainstream services like Gmail and Outlook offer straightforward drag-and-drop functionality. Privacy-conscious users should consider how their email provider handles attachments and metadata\u2014services like Onion Mail, ProtonMail, and Mailfence offer varying approaches to balancing usability with privacy protection.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"next-steps\"><\/span>Next Steps<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Practice attaching emails in your primary email client using the methods above<\/li>\n<li>Verify recipients can successfully open your attached emails<\/li>\n<li>If handling sensitive information, investigate PGP encryption and privacy-focused email services<\/li>\n<li>Set up desktop email clients (Thunderbird, Outlook) for maximum flexibility<\/li>\n<li>Document your workflow for future reference, especially in professional contexts<\/li>\n<\/ul>\n<p>Remember that email attachment capabilities directly correlate with your email provider&#8217;s architecture. Services built on open standards (IMAP\/SMTP) generally offer more flexibility than proprietary webmail-only platforms.<\/p>\n<p>If privacy and security are priorities in your email workflow\u2014particularly when attaching sensitive correspondence\u2014consider exploring <a href=\"https:\/\/onionmail.org\">Onion Mail<\/a>, which combines Tor anonymity, PGP encryption, and standard email protocols. With no registration data required and full IMAP\/SMTP support, you gain both privacy protection and compatibility with powerful desktop clients that make email attachment seamless.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Attaching an entire email message to another email is essential for forwarding conversations with headers intact, reporting spam, or sharing correspondence. This comprehensive guide covers all major email clients.<\/p>\n","protected":false},"author":1,"featured_media":175,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[258,260,144,261,262,259],"class_list":["post-176","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-security","tag-email-basics","tag-email-clients","tag-email-privacy-2","tag-email-security-2","tag-how-to","tag-how-to-guides"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Attach Email to Email: Complete Guide for 2026 - Onion Mail \u2014 Privacy, Encryption &amp; Tor<\/title>\n<meta name=\"description\" content=\"Learn how to attach email to email in Gmail, Outlook, Thunderbird and privacy-focused services. 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